hello

when i'm on slow driving, low rpm 2000 the engine hiccups a little...
my idle fluctuates, i think this is related ...

how do i fix this ?

thanks

 

Ford Expeditions, F150's and Excursions with 5.4L V8's, not to mention the venerable Crown Victoria 4.6L, are prone to the kind of problem. Lincoln's are the same way.

Please be kind and at least tell us some basic information, like, what you drive, what you have done to it, when it started, what was the last thing you did to it (or a shop did) ETC.

 

sorry,

-clean the AICV and FITV
-tried 3 TPS. 2 used 1 new
-tried and clean 2 TBs
-bleeding air out of coolant system
-check for my vacuum routing didn't found problems and used carburetor cleaner
-tried other spark cables from a B18C4

engine cold dont fluctuates .
engine is running and fluctuation, i stop, and start , the engine stays 30s without fluctuations

here a video of my idle (use headphones) on pc speakers its hard to notice.

 

here´s a video when i unplug the TPS wire

 

I think I found your problem. One of your valve cover nuts is missing! Just kidding.

Even with that issue, sounds like it runs pretty good.

 

made other test

with engine running and fluctuating...
i unplug a spark cables, plug again and stops fluctuating